You could be right, but wasn't an issue for me as I'm unlikely to see positive equity on the iX finance and need to see out the term.
Didn't ask about fixing the order value, and I'm likely to tinker with the order over the next few months anyway, especially if more options become available.
I put in an order for an SUV turbo earlier this week, aiming for a March delivery to align with the end of the PCP on my iX. Dealer said that turbo orders going in now are expected to deliver early in the new year.